The Open UP holds you open. Nice and wide. Made of stainless steel, this cone-funnel shaped penis plug is a little shorter and wider than average cock stuffing plug, and is fantastic for training and stretching. Its central through hole measures 5mm (yes that\'s FIVE!) This penis plug can be used by itself, or for keeping the penis open to insert additional 4mm slim sounds. The Open UP Penis Plug is precision made of medical grade stainless steel, and is fantastic for cock stuffing, training and stretching. Of course the central hole allows you to pee or cum without removal, and is great for games of cum control. Overall Length: 42.5mm Insertable Length: 30mm Maximum Diameter: 11.9mm Minimum Diameter: 8mm Diameter of central internal hole: 5mm